mirror of https://github.com/bsnes-emu/bsnes.git
84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
#pragma once
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#include <typeinfo>
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#include <nall/traits.hpp>
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namespace nall {
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struct any {
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any() = default;
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any(const any& source) { operator=(source); }
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any(any&& source) { operator=(move(source)); }
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template<typename T> any(const T& value) { operator=(value); }
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~any() { reset(); }
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explicit operator bool() const { return container; }
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auto reset() -> void { if(container) { delete container; container = nullptr; } }
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auto type() const -> const std::type_info& {
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return container ? container->type() : typeid(void);
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}
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template<typename T> auto is() const -> bool {
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return type() == typeid(typename remove_reference<T>::type);
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}
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template<typename T> auto get() -> T& {
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if(!is<T>()) throw;
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return static_cast<holder<typename remove_reference<T>::type>*>(container)->value;
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}
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template<typename T> auto get() const -> const T& {
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if(!is<T>()) throw;
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return static_cast<holder<typename remove_reference<T>::type>*>(container)->value;
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}
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template<typename T> auto get(const T& fallback) const -> const T& {
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if(!is<T>()) return fallback;
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return static_cast<holder<typename remove_reference<T>::type>*>(container)->value;
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}
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template<typename T> auto operator=(const T& value) -> any& {
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using auto_t = typename conditional<is_array<T>::value, typename remove_extent<typename add_const<T>::type>::type*, T>::type;
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if(type() == typeid(auto_t)) {
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static_cast<holder<auto_t>*>(container)->value = (auto_t)value;
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} else {
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if(container) delete container;
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container = new holder<auto_t>((auto_t)value);
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}
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return *this;
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}
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auto operator=(const any& source) -> any& {
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if(container) { delete container; container = nullptr; }
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if(source.container) container = source.container->copy();
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return *this;
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}
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auto operator=(any&& source) -> any& {
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if(container) delete container;
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container = source.container;
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source.container = nullptr;
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return *this;
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}
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private:
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struct placeholder {
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virtual ~placeholder() = default;
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virtual auto type() const -> const std::type_info& = 0;
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virtual auto copy() const -> placeholder* = 0;
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};
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placeholder* container = nullptr;
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template<typename T> struct holder : placeholder {
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holder(const T& value) : value(value) {}
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auto type() const -> const std::type_info& { return typeid(T); }
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auto copy() const -> placeholder* { return new holder(value); }
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T value;
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};
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};
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}
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